Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 44: Spin Torque and Spin Excitations II

MA 44.1: Vortrag

Donnerstag, 3. April 2014, 15:00–15:15, HSZ 403

First-principles determination of spin-orbit torques within relativistic KKR — Diemo Ködderitzsch, Marten Seemann, Sergiy Mankovskyy, and •Hubert Ebert — Universität München, Dept. Chemie, Butenandtstraße 5-13, D-81377 München, Germany

The prediction and experimental observation of torques acting on the magnetization due to an applied electric field induced by spin-orbit interaction and broken inversion symmetry has recently attracted a lot of interest.[1,2] Employing a recent Kubo-Bastin-like formulation for the determination of spin-orbit torques [3] we here present a fully relativistic implementation within the KKR first-principles electronic structure method. The matrix elements for the torkance-current correlation functions are calculated in a similar manner as those occurring in transverse transport and the Gilbert damping.[4,5] A symmetry analysis of the occurring torque terms is given. Applications to disordered systems will illustrate the approach.

[1] Manchon, Zhang, PRB 78, 212405 (2008); [2] Gambardella, Miron, Phil. Trans. R. Soc 369, 3175 (2013); [3] Freimuth, Blügel, Mokrousov, arXiv: 1305:4873v1 (2013); [4] Lowitzer, Ködderitzsch, Ebert, PRL 105, 266604 (2010); [5] Ebert, Mankovsky, Ködderitzsch, PRL 107, 066603 (2011)